Deciduous Tree Galls

Galls are abnormal growths on plants that can result from the feeding of living organisms such as bacteria, fungi, nematodes, insects and mites. Learn about common galls in this factsheet.

Maple Gall Mites (Eriophyidae)

Inside little green or red bumps or other weird growths on maple leaves are tiny eriophyid mites, feeding on the developing gall tissue. Learn more about these mites and what to do about them in this article on maple gall mites.

Protecting Your Tree From Emerald Ash Borer

EAB was discovered in Wisconsin in 2008 and has been slowly spreading ever since. In this video, entomologists demonstrate how homeowners can protect their trees from this insect.

Is My Ash Tree Worth Treating for Emerald Ash Borer?

When should I treat my ash tree for EAB? This factsheet addresses some of the most frequently asked questions regarding the treatment of ash trees for EAB, and the removal and disposal of infested trees.

Organic Lawn Fertilization

Interest in organic, sustainable gardening has grown to include lawn care practices, including use of organic fertilizers derived from natural sources. Learn how organic and conventional fertilizers differ here.

Ash Alternatives for Homeowners and Professionals

Find suggestions for which trees to plant to replace ash trees, which are being devastated by Emerald Ash Borer.

Homeowner Guide to Emerald Ash Borer Insecticide Treatments

This factsheet describes considerations and products for treating ash trees with insecticides to control Emerald Ash Borer.

Chlorosis

Chlorosis is a common nutritional disorder of many woody ornamentals in Wisconsin, particularly in the southern and eastern parts of the state. This factsheet describes symptoms, causes and cures.

Home Landscape Insecticides

This factsheet describes active ingredients available for homeowners and the landscape insects they control.

Lilacs for Cold Climates

Learn about the best-rated lilacs for Wisconsin’s cold climate, and how to care for these plants for years of enjoyment.

Calculating Degree Days

Degree Days incorporate temperature and time to quantify the rate of plant and insect development. This useful tool helps predict events such as flowering, harvest, and pest outbreaks.